Internal-combustion engine



April 14, 1925. 1,533,503

C. H. KNUDSEN INTERNAL COMBUSTION ENGINE Filed June 18 1921 2 Sheets-Sheet 1 T -j- E- l f /Z 1 i i 30G l/ /AS ,5 E 3 4 f /Z 2\, I f 2q f y 2H /200 5 /f fr \3/ 2T zo@ /l G C) H. Knudsen,

@53 'his @Hom/ s April 14, 1925..

C. H. KNUDSEN INTERNAL COMBUSTION ENGINE @nba/nmz Carl H Knudsen Filed June 18, 1921 35% his @bho/0n s 4Patented Apr. 14, 1925.

UNITED STATES CARL H. KNUDSEN, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE KNUDSEN MOTORy 1,533,503 PATENT OFFICE.

CORPORATION, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE.

NTERNAL-COMBUSTION ENGINE.

Application led .Tune 18, 1921.

To all 'whom it may concern:

Be it known that I, CARL H. KNuDsnN, a citizen'of the United States, and residing at Brooklyn, in the county of Kings'and State of New lYork, have invented certain new and useful Improvements in Internal-Combustion Engines, of which the following is a specification, such as will enable those Skilled in the art to which it appertains to make and use the same.

This invention relates to internal combustion engines, and particularly to what are known as fuel oil engines designed to be used for marine and similar purposes, and the object of the inventionis to provide a V-type engine of the class specified having a single compression and combustion chamber, one of the cylinders acting as an intake or scavenger cylinder and the other as an vexhaust cylinder; a further object being to provide means 'forsintroducing air into the intake or scavenger cylinder' through the pistons in the separate cylinders of the engine whereby said pistons may be kept cool; and with these and other objects in view the invention consists in an engine of the class and for the purpose specified which is simple in construction and operation and efficient in use, and which is constructed and operated as hereinafter described and claimed.

The invention described and claimed herein is an improvement on that shown and described in a prior application led by me April 26, 1920, Serial No. 376,548.v and is fullyv disclosed -in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable referencev characters in each of the views, and in which r Fig. 1 is a partial transverse sectional view of my improved enginey and showing the cylinder and piston construction;

Fig. 2 a partial section on the line 2f-2 of Fig. 1;

Fig. 3 a partial section on the line 3-3 of Fig. 1;

Fig. 4 a partial section on the line 4-4 of Fig. 1; and,

Figs. 5 and 6 are detail sectional views of the head end of the pistons which I emplty and shown on an enlarged scale.

n Fig. 1 of the drawing I have shown at 10 the intake or scavenger cylinder of the Serial No. 478,582.

engine and at 11 the exhaust cylinder;these inder head 12, which, with the top portions `of the cylinders 10 and 11 form the combustion chamber 13 of the engine, and a suitable fuel admission valve 14 is connected with the head and communicates centrally with the combustion chamber 13.

Mounted at one side of the cylinder 11 is an intake and exhaust manifold 15 having an intake passage 16 and an exhaust passage 17. Air under pressure from any suitable source is adapted to be passed into the intake passage, and thus into the engine,

or the intake or scavenger cylinder 1() thereof, as hereinafter set out. y

Mounted in the cylinders 10 and 11 are pistons 18 which areapproximately of the same general form and construction and which are operated by a suitable connecting rod 19 pivotally mounted in connection with said piston, as indicated at 20, and said rods are operated bythe cranks of crank shafts in the usual manner.

In Figs. 5 and 6 of the drawing, I have shown in detail the construction of the pistons 18, or the ,head end portions thereof, and said pistons are provided at a predetermined distance below the upper or head end thereof with ports or passages 21 equally spaced around the walls of said pistons and transverse arc-shaped walls 22 divide the pistons into upper and lower chambers 23 and 24, and said ports or passages communicate with the upper chamber 23 as will be seen. lA vertical partition or baie wall 25 extends upwardly into the chamber 23 of each piston centrally and transversely thereof, and divides the ports or passages 22 in each cylinder into separate sets, and these walls are so arranged as to permit of the passage of air into the piston 18 of the cylinder 11 through ports or passages 26 at one side of said cylinder and through one set lof the ports or passages 21, into the chamber 23 of said piston,-upwardly and downwardly over the partition or bailie wall 25 of said piston, and outwardly through the other set of ports o`r passages 21 in said piston and through ports or passages 27 at the opposite side of the cylinder 11 .thence through a chamber 28 formed by a pipe lor manifold 29 mounted between the separate vcylinders 10 and 11 and into a chamber 30 msy through orts or passages 31 at one side of the cylinlder 10 into and through one set of the ports or passages 21 in the piston 18 mounted in the cylinder 10 into the chamber 23 of said piston upwardly and downwardly over the baffle wall 25 of said piston and out through the other set of ports or passages 21 of said piston and through ports or passages 32 at the opposite side of said cylinder and into the chamber 30a.

It will be understood that the chamber 3()a extends upwardly around the cylinder 10 above the ports or passages 32 thereof, as clearly shown in Figs. 1 and 3, and this chamber forms a communication between the chamber 28 and the ports or passages 32 and intake ports 33 which open into the cylinder 10. In other words, the air passed into the intake orscavenger cylinder 10 is passed through the chamber 23 of the piston 18, which is mounted in the cylinder 11 thence through the chamber 28 and through the chamber 23 of the piston 18 of the cylinder 10 and into said last named cylinder p through the intake ports or passages 33.

The cylinder 11 is provided at a predetermined distance above the ports or passages 26 and 27 therein with exhaust ports or passages 34 `whioh form a communication between said cylinder and the exhaust passage 17 in the manifold 15 through an annular chamber 35 formed in the cylinder 11 about the ports or passages 34'.

In the operation of the engine-and in the downward movement of the pistons 18 in the cylinders 10 and 11, the piston ofthe cylinder 11 moves downwardly in advance of the piston of the cylinder 10 to permit of the opening of the exhaust ports or passages 34 in advance of the opening of the intake ports or passages 33, and`when the ports or passages 21 register with the ports or passages 26 and 27 air under pressure Jfrom the intake passage 16 passes through the piston in the cylinder 11 and through the piston ofthe cylinder 10, it being understood that the ports or passages 21 of said piston are registering with the ports or passages 31 and 32, and into the chamber 30* of the cylinder 10 and thence into said cylinder above the piston therein through the intake ports or passages 33. In the upward movement of the pistons in said cylinders the air is compressed to ignite the fuel sprayed into the combustion chamber 13 in the usual manner, and the products of combustion pass outward through the exhaust ports or passages 34 in the downward movement of said pistons, as above set out.

It will also be apparent lthat the intake ports or passages 33 and exhaust ports or passages 34 do not register with .the ports or passages 21 inthe pistons in thelr upward and downward movement, and the air passed into the intake or scavenger cylinder 10 in the first instance will operate to clean out the cylinders of the products of combustion thus producing an engine of the class and for the purpose specified, having a perfect scavenger action, and by reason of the method of passing air through the head ends of the pistons in the separate cylinders as hereinbefore described the overheating of said pistons and the engine in general is obviated.

While I have shown my invention as applied to an internal combustion engine of specified `form and construction, it will be understood that I am not necessarily limited in this respect, nor am I limited to the details of construction herein shown and described for carrying my invention into effect, and various changes therein and modifications thereof may be made, within the scope of the appended claims, without departing from the spirit of myJinvention or sacrificing its advantages.

aving fully described my invention,

what I claim as new and desire to secure by Letters Patent, is

1. A11 engine of the class described comprising a pair of cylinders having a common' combustion chamber, one of said cylinders comprising the intake cylinder and having intake ports and the other the exhaust cylinder and having exhaust ports, pistons in said cylinders and controlling said orts, said pistons being provided in the hea end portions thereof with closed chambers, and means for introducing air directly into and through the closed chamber of the piston in the exhaust cylinder and thus into and through the closed chamber of the piston in the intake cylinder and into both cylinders through said intake ports.

2. An engine of the class described comprising a pair of cylinders having a common combustion chamber, one of said `cylinders being provided with intake lports and the other with exhaust ports, each of said cylinders being provided below the first named ports therein with other ports means for placing the last named ports oi both cylinders in communication, a compressed air supply means in communication with the last named ports of the exhaust cylinder, and said pistons being provided with ports or passages adapted to register with-the second named ports ofthecylinders whereby air from said compressed air supply means may be passed directly into' y and through first the piston .in the exhaust cylinder and then into and through the piston in the intake cylinder and into both cylinders through said intake ports.4

3. An engine ofthe class described comprising'a pair of cylinders having a common combustion chamber, one of said cylinders being provided with intake orts and the other with exhaust ports, eac of said named ports therein with other ports, means yfor placing the last named` ports of both cylinders in communication, a compressed air supply means 1n communlcation vwith the last named ports of the exhaust cylinder, pistons in said cylinders for controlling said intake and exhaust ports in. such manner as to open and close the exhaust ports in advance of the intake ports, said pistons being provided with ports or passages adapted to register with the second named ports of the cylinders whereby air from said compressed air supply means maybe passed directly into andv through r'st the piston in the exhaust 'cylinder and then into and through the piston in the intake cylinder and into both cylinders through said intake ports, and means in each of the pistons 'for confining the air passed therethrough to the head end portions of said pistons.

- 4. An engine of the class described comprising a pair of cylinders having a common combustion chamber, one of said cylinders being provided with intake ports and the other with exhaust ports, each of said cylinders being provided below the first named ports therein with other circumferentially arranged ports, means for placing a predetermined number of the last named ports o both cylinders inv communication7 a compressed air supply means in communication with the second named ports of the exhaust cylinder, pistons in said cylinders for controlling said intake and exhaust ports, and said pistons being provided in v the head end portions `thereof with closed chambers and with ports or passages opening into said chambers and adapted to register with the second named ports of the cylinders, whereby'air from said compressed air supply means will pass successively into and'through the chamber in the piston ofv the exhaust cylinder and into and through the chamber in the piston of the intake cylinder and linto both cylinders through said intake ports.

y 5. A V-shaped engine of the class described comprising cylinders arranged in pairs` a cylinder head for each pair of cy1 inders having a combustion chamber common to .both cylinders, one of said cylinders being providedwith intake ports and the other with exhaust ports, pistons in said cylinders for controlling said intake and exhaust-ports, lsaid pistons being provided inthey head portions thereof with closed chambers, said cylinder being provided below the intake and exhaust orts ltherein with ports or passages andy sai pistons being providedA :with ports or passages adapted to register*v with .said last named ports or passages and opening inwardly in` to the chambersof saidpistons, and means for passing air under pressure directly into and through the chamber of the piston kin the exhaust cylinderfthus into and through the chamber of the piston in the intake cyl.- 1

inder andinto both cylinders through said intake ports, said last namedmeans involving a passage for placing the adjacentcylinder ports in communication.

In testimony that I claimthe foregoing.

as my invention I have signed my name in' presence of the subscrlbing w1tnesses this.

10th day of June 1921.

CARL H. KNTUDSEN.

Witnesses: l

C. E. MULBEANY, H. ETHoMPsoN. 

